The lawmakers urged an international response by the end of the
year. Or, Sen. Lindsey Graham (R-S.C.) warned, the "whole
region's going to fall into chaos."

Graham seemed to warn that if the U.S. doesn't act, terrorist
attacks involving chemical weapons could occur in the U.S.

"If we don't change course in Syria, it's going to become a
failed state by the end of the year," Graham said on CBS' "Face
the Nation."

"It's fracturing along sectarian ethnic lines, it's going
to be an al-Qaeda safe haven. The second thing is the chemical
weapons, enough to kill millions of people, are going to be
compromised and fall into the wrong hands and the next bomb that
goes off in America might not have nails and glass in it."

"The president drew a red line
on chemical weapons, thereby giving a green light to Bashar
al-Assad to do anything short of that," McCain said on
NBC's "Meet
the Press."

Meanwhile, Democratic Sen.
Claire
McCaskill (D-Mo.) said on CBS that no options should be ruled
out in a response, including putting troops in Syria. McCain,
though, said that would be the "worst thing" the U.S. could do to
respond, since animosity toward America remains high in the
region.